Temperature-sensitive intelligent response tunnel lining structure and manufacturing mold and manufacturing method thereof

Abstract

The invention relates to a temperature-sensitive intelligent response tunnel lining structure and a manufacturing mold and method thereof, the lining structure comprises an outer layer, a middle layer and an inner protective layer, the three layers are bonded through a temperature-sensitive structural adhesive to form an arc-shaped lining unit, and the outer layer and the inner protective layer are FPR layers with continuous fiber reinforced networks distributed inside; the middle layer is a UHPC (Ultra High Performance Concrete) layer doped with toughness reinforcing filler; and temperature sensing pieces connected with the fiber reinforced network are embedded in the edges of the outer layer and the inner protective layer. The manufacturing mold comprises a main body arc-shaped mold frame and two separation mold plates, the separation mold plates are divided into three pouring mold cavities after being inserted, fiber reinforced networks with temperature sensing pieces are placed in the pouring mold cavities of the outer layer and the inner protective layer, and all the pouring mold cavities are formed in a pouring mode. And gaps formed by drawing out the separation templates are filled with temperature-sensitive structural adhesives, so that the three layers of structures are bonded and fixed, and a finished lining unit is formed after demolding. The cable has a temperature active corresponding function, is not easy to burst at high temperature, is high in structural stability and is easy to produce and process.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, specifically to the field of tunnel support structure technology in civil engineering. More specifically, it relates to a temperature-sensitive intelligent response tunnel lining structure that achieves fire and explosion protection through temperature sensing and stress release functions, as well as its manufacturing mold and manufacturing method. Background Technology

[0002] In underground engineering projects such as highway and railway tunnels and underground utility tunnels, tunnel linings, as the core load-bearing and protective structures, face severe challenges from extreme high-temperature environments such as fires. During a fire, the temperature inside a tunnel can rise to 300–600°C in a short time. Traditional tunnel lining structures are prone to two major fatal problems: first, the rapid vaporization of moisture inside the concrete generates high pressure, triggering explosive spalling and destroying the integrity of the lining structure; second, the strength of ordinary concrete decreases sharply with increasing temperature, dropping by up to 50% at 200°C, leading to structural instability and collapse, seriously threatening the safety of personnel evacuation and rescue.

[0003] Currently, the main fire prevention measures used in tunnel construction include spraying fire-retardant coatings, installing fire-resistant steel structures, and using ordinary FRP-UHPC composite linings. While spraying fire-retardant coatings is simple to apply, they are prone to aging and peeling after long-term use, resulting in insufficient fire resistance. Fire-resistant steel structures require additional installation and fixing, increasing structural weight and construction costs, and their integration with the lining body is poor. Although ordinary FRP-UHPC composite linings combine high strength and high durability, they lack a temperature response mechanism, making the FRP-UHPC interface prone to delamination failure at high temperatures. This fails to alleviate internal thermal stress in the UHPC and still poses a risk of bursting.

[0004] Some studies have attempted to improve high-temperature resistance by optimizing the FRP matrix formulation, but no active response mechanism has been established. When fiber reinforcement is incorporated into UHPC to enhance toughness, insufficient dosage results in limited anti-burst effect, while excessive dosage affects construction fluidity and interfacial bonding performance. Therefore, developing a tunnel lining structure that can actively sense temperature changes, intelligently release thermal stress, and synergistically improve structural mechanical properties has become a key technical requirement for addressing tunnel fire safety hazards. Summary of the Invention

[0005] To overcome the above shortcomings, the purpose of this invention is to provide a temperature-sensitive intelligent response tunnel lining structure, its manufacturing mold, and its manufacturing method, thereby solving the technical problems of existing tunnel lining structures lacking active temperature response capabilities, being prone to cracking at high temperatures, and exhibiting poor structural stability. This objective is achieved through the following technical solution.

[0006] A temperature-sensitive intelligent response tunnel lining structure is disclosed, the key structural feature of which is that the tunnel lining structure comprises an outer layer, a middle layer, and an inner protective layer. The three layers are bonded together by a temperature-sensitive structural adhesive to form a strongly bonded integral arc-shaped lining unit. The outer layer and the inner protective layer are both FPR fiber-reinforced composite material layers, with shape memory epoxy resin as the matrix and a continuous fiber reinforcement network distributed internally. The middle layer is a UHPC layer, i.e., ultra-high performance concrete as the matrix, with toughness-reinforcing filler uniformly mixed inside to form a three-dimensional reinforcement system. Temperature sensors are embedded at the edges of both the outer layer and the inner protective layer, and the temperature sensors are connected to the corresponding fiber reinforcement network to form a temperature-sensing system. Based on the overall bonding of the three-layer structure, the fiber reinforcement network and the toughness-reinforcing filler form a synergistic force-bearing system for mechanical load-bearing and thermal stress resistance. Through the above structure, the shape-memory epoxy resin matrix of the outer and inner protective layers softens and releases energy when the temperature reaches a critical value, significantly reducing the accumulation of thermal stress in the middle UHPC layer and preventing high-temperature cracking. Simultaneously, at room temperature, the fiber reinforcement network bears tensile / shear stress, while the toughening filler enhances the crack resistance and compressive strength of the UHPC, with stress effectively transferred through the interface. At high temperatures, the fiber reinforcement network releases energy with matrix deformation, while the toughening filler inhibits the propagation of thermal cracks. These two functions complement each other, ensuring the overall mechanical performance of the structure. The aforementioned temperature sensor facilitates connection to external monitoring devices, enabling real-time temperature monitoring and response status feedback.

[0007] The fiber-reinforced network in the outer and inner protective layers is composed of a blend of carbon fiber and glass fiber, with carbon fiber accounting for 15% to 25% of the total fiber mass. Through this structure, the fiber-reinforced network possesses both high strength and good toughness, and works in conjunction with shape memory epoxy resin to achieve both temperature response and mechanical load-bearing functions.

[0008] The toughening reinforcing filler in the middle layer is a composite system of steel fiber and graphene. The steel fiber has a length of 12-18 mm and a volume fraction of 3%-5%, while the graphene content is 0.5%-1.0% of the mass of the cementitious material used in the middle layer fabrication. This structure optimizes the amount of reinforcing components, ensuring excellent anti-burst performance while maintaining the mechanical properties (compressive strength ≥150 MPa, flexural strength ≥35 MPa) and structural synergy of the lining structure.

[0009] The temperature sensor is a nickel-chromium alloy wire. One side of the nickel-chromium alloy wire is embedded inside the edge of the fiber-reinforced composite material layer and in close contact with the internal fiber reinforcement network, while the other side extends out of the lining unit with a length of 8-12 mm. This structure ensures the nickel-chromium alloy wire temperature sensor is highly responsive and can be connected to an external intelligent monitoring system for real-time temperature monitoring, avoiding functional degradation after long-term use.

[0010] The outer and inner protective layers each have a thickness of 4–8 mm, the middle layer has a thickness of 150–200 mm, the lining unit has an arc of 90°–120°, and the width of a single lining unit is 1200–1500 mm. This structure ensures the overall stability and robustness of the tunnel lining structure, making it suitable for the actual needs of tunnel engineering.

[0011] The inner and outer surfaces of the middle layer are both textured with a depth of 2-3 mm. This structure enhances the adhesion between the middle layer and the outer and inner protective layers, preventing interfacial peeling under temperature cycling.

[0012] The mold includes a main arc-shaped mold frame formed by splicing two arc-shaped semi-frames, and two arc-shaped partition templates. The main mold frame has an open-top arc-shaped casting cavity, meaning each of the two arc-shaped semi-frames forms an arc-shaped semi-casting cavity. The two ends of the partition templates slide into and engage with the ends of the arc-shaped casting cavities within the main arc-shaped mold frame. After this engagement, the two partition templates divide the arc-shaped casting cavities into three casting cavities corresponding to the outer layer, middle layer, and inner protective layer, respectively. After the three casting cavities are cast, the partition templates are removed, and the outer layer, middle layer, and inner protective layer form cavities filled with the temperature-sensitive structural adhesive. This mold structure allows for the one-time integral casting and molding of the outer layer, middle layer, and inner protective layer. After molding, the partition templates are removed to form cavities, facilitating direct filling with the temperature-sensitive structural adhesive for bonding and fixation. The overall installation and use are highly efficient and convenient, effectively improving production efficiency.

[0013] The main arc-shaped mold frame has positioning grooves at both ends of the casting mold cavity corresponding to the outer and inner protective layers, corresponding to the temperature sensors at both ends of the fiber reinforcement network. The bottom of the junction of the two arc-shaped half-frames of the main mold frame also has positioning grooves corresponding to the temperature sensors at the bottom of the fiber reinforcement network. This structure facilitates the positioning and installation of the fiber reinforcement network and temperature sensors within the casting mold cavity without affecting the demolding operation after overall casting.

[0014] The two arc-shaped half-frames of the main arc-shaped mold frame are provided with aligned outward-turning flanges at their joint. The flanges of the two arc-shaped half-frames are locked together by locking components to form a sealed fixation. This structure facilitates the quick assembly and disassembly of the two arc-shaped half-frames.

[0015] The method for fabricating a temperature-sensitive intelligent response tunnel lining structure based on the above-mentioned mold includes the following steps: a. Clean the arc-shaped casting cavity and partition template of the main arc-shaped mold frame, and evenly apply release agent to the inner wall of the arc-shaped casting cavity and the partition template. The coating thickness is 0.1-0.2mm. Let it stand for 15-20 minutes until the release agent is surface dry. b. Join the two arc-shaped half-frames to form the main arc-shaped mold frame, and insert the dividing template into the bottom along both ends of the main arc-shaped mold frame to divide the arc-shaped casting cavity into three casting mold cavities corresponding to the outer layer, middle layer and inner protective layer; c. The fiber-reinforced network and the temperature sensor are pre-fixed and connected to form an integral whole, and respectively placed into the casting cavities of the outer and inner protective layers within the main arc-shaped mold frame. The temperature sensor and the positioning groove on the inner circumferential surface of the corresponding casting mold cavity form an insertion positioning fit to position the entire fiber-reinforced network. d. Pour shape memory epoxy resin matrix into the casting mold cavity corresponding to the outer and inner protective layers of the main arc mold frame, and control the viscosity at 600-900 mPa·s to the required layer thickness; e. Prepare a UHPC mixture containing toughness-enhancing filler, pour it into the casting cavity of the corresponding middle layer in the main arc-shaped mold frame, and vibrate it at a high frequency of 30,000 to 40,000 r / min for 2 to 3 minutes until it is compacted; f. After the outer, middle, and inner protective layers of steps d and e have been formed and stabilized, the partition template is pulled out from the top of the main arc-shaped mold frame. The outer, middle, and inner protective layers form a cavity with each other. The cavity is filled with temperature-sensitive structural adhesive until the three-layer structure is bonded and fixed. g. After curing, separate the two arc-shaped half-frames of the main arc-shaped mold frame to obtain the finished lining unit.

[0016] This invention improves tunnel lining by providing an active temperature response function, making it less prone to cracking at high temperatures, exhibiting strong structural stability, and facilitating the connection of external monitoring devices for temperature monitoring and response status feedback. Furthermore, the overall mold structure of this invention is relatively simple, employing a modular mold design that reduces the difficulty of industrial production. The final product is integrally molded, resulting in high production efficiency and strong product consistency. This invention is suitable for use as a lining structure in tunnel engineering, particularly for preventing tunnel fire safety hazards, and for structural improvements to similar products. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the tunnel lining unit of the present invention.

[0018] Figure 2 yes Figure 1 A cross-sectional structural diagram.

[0019] Figure 3 This is a schematic diagram of the assembly structure of the manufacturing mold of the present invention.

[0020] Figure 4 yes Figure 3 A schematic diagram of the completed mold assembly.

[0021] Figure 5This is a schematic diagram of the structure of the fiber-reinforced network and temperature sensing element of the present invention.

[0022] Figure 6 This is a partial cross-sectional view of the mold used in the present invention.

[0023] Figure 7 This is a schematic diagram of the top surface structure of the mold for manufacturing the present invention, in which the partition template has been improved.

[0024] The numbers and names in the diagram are as follows: 1. Outer layer, 2. Middle layer, 3. Inner protective layer, 4. Temperature-sensitive structural adhesive, 5. Temperature sensor, 6. Fiber reinforced network, 7. Rotating support, 701. Rotating swing arm, 8. Main arc-shaped mold frame, 801. Slide groove, 802. Positioning groove, 803. Flanged edge, 9. Locking component, 10. Separating template, 1001. Lifting hole, 1002. Vertical rib. Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] like Figure 1 , Figure 2 As shown, the temperature-sensitive intelligent response tunnel lining structure includes an outer layer 1, a middle layer 2, and an inner protective layer 3. The three layers are bonded together by a temperature-sensitive structural adhesive 4 to form an integral arc-shaped lining unit with strong interfacial bonding. The arc of the lining unit is 90° to 120°, and the width of a single lining unit is 1200 to 1500 mm.

[0027] Both the outer and inner protective layers are FPR fiber-reinforced composite material layers. The matrix of the fiber-reinforced composite material layer is shape memory epoxy resin with a thickness of 6 mm (adjustable within the range of 4-8 mm according to engineering requirements). A continuous fiber reinforcement network 6 is distributed within the epoxy resin. The fiber reinforcement network is composed of a blend of carbon fiber and glass fiber, with carbon fiber accounting for 20% of the total fiber mass (adjustable within the range of 15%-25%). The fiber reinforcement network is cured through the shape memory epoxy resin matrix to form a composite layer with both temperature response and mechanical reinforcement functions. The glass transition temperature of the shape memory epoxy resin... T g The temperature is set to 75℃ (adjustable within the range of 60-90℃). Temperature sensors 5 are embedded in the edges of both the outer and inner layers. The temperature sensors are nichrome alloy wires with a diameter of 0.5-0.8mm. One end of the nichrome alloy wire is embedded 8-10mm inside the edge of the outer and inner protective layers, forming a connection with the fiber reinforcement network. The other end of the nichrome alloy wire extends 10mm outside the edge of the lining unit (adjustable within the range of 8-12mm). The surface of the extended part is treated with anti-corrosion and insulation (such as coating with polytetrafluoroethylene), which is used to connect to an external temperature monitoring device or as a signal connection between adjacent lining units.

[0028] The aforementioned middle layer is a UHPC layer, which uses ultra-high performance concrete as its matrix and has a thickness of 180mm (adjustable within the range of 150-200mm). It is uniformly incorporating toughness-reinforcing fillers, a composite system of steel fibers and graphene. The steel fibers are 15mm long (adjustable within the range of 12-18mm) with a volume fraction of 4% (adjustable within the range of 3%-5%). The graphene content is 0.8% of the mass of the cementitious material used in the production of the middle UHPC layer (adjustable within the range of 0.5%-1.0%). This creates a three-dimensional reinforcement system within the middle UHPC layer, significantly improving its crack resistance and toughness. When the middle UHPC layer is bonded and fixed to the outer and inner protective layers using temperature-sensitive structural adhesive, the three-dimensional reinforcement system and the fiber reinforcement network form a synergistic stress-bearing system.

[0029] The inner and outer surfaces of the aforementioned middle layer can also be textured with a depth of 2-3 mm to improve the adhesion between the middle layer and the outer and inner protective layers.

[0030] In the fabrication of this tunnel lining structure, the outer layer, middle layer, and inner protective layer are typically formed using separate molds with corresponding shaped cavities. After fabrication, the three layers are then bonded together as a whole through grinding and adhesive application. However, this method is inefficient overall. Therefore, this invention provides a one-piece molding mold, the specific structure of which is as follows.

[0031] The mold includes a main arc-shaped mold frame 8 formed by splicing two arc-shaped half-frames, and two arc-shaped dividing templates 10. Both arc-shaped half-frames are connected to the shaft of a rotating support 7 via independent rotating swing arms, allowing the two arc-shaped half-frames to join or separate as they rotate along the rotating support. During splicing, the splicing surfaces of the two arc-shaped half-frames have aligned flanges 803. One flange is bolted to a U-shaped locking element 9 that slides relative to the bolt. The U-shaped opening of the locking element locks the flanges of the two half-frames, and the bolts secure the mold for complete fixation. Arc-shaped semi-casting cavities are formed within each of the two arc-shaped half-frames, thus forming a complete arc-shaped casting cavity after splicing. The two ends of the aforementioned partition template form a sliding insertion fit with the sliding grooves 801 at both ends of the arc-shaped casting cavity inside the main arc-shaped mold frame. After the two partition templates are inserted, they divide the arc-shaped casting cavity into three casting mold cavities corresponding to the outer layer, middle layer, and inner protective layer, respectively. A portion of the top of the partition template extends beyond the top of the main arc-shaped mold frame, and the extended portion is equipped with a lifting hole 1001 for easy operation. The casting mold cavities inside the main arc-shaped mold frame corresponding to the outer layer and inner protective layer have positioning grooves 802 at both ends corresponding to the temperature sensors at both ends of the fiber-reinforced network. The bottom of the junction of the two arc-shaped half-frames of the main mold frame has positioning grooves corresponding to the temperature sensors at the bottom of the fiber-reinforced network. The temperature sensors at the top of the fiber-reinforced network are directly exposed and do not require positioning. After the three casting mold cavities are cast and formed, the partition template is removed. The outer layer, middle layer, and inner protective layer form a glue cavity filled with temperature-sensitive structural adhesive. The glue cavity is then filled with temperature-sensitive structural adhesive for bonding and fixing. The overall installation and use are relatively efficient and convenient, improving production efficiency.

[0032] Based on the above-mentioned mold making method, the method for manufacturing the tunnel lining structure includes the following steps.

[0033] a. Clean the arc-shaped casting cavity and partition template of the main arc-shaped mold frame, and evenly apply release agent to the inner wall of the arc-shaped casting cavity and partition template. The coating thickness is 0.1-0.2mm. Let it stand for 15-20 minutes until the release agent is surface dry.

[0034] b. Join the two arc-shaped half-frames to form the main arc-shaped mold frame, and insert the dividing template into the two ends of the main arc-shaped mold frame to the bottom, dividing the arc-shaped casting cavity into three casting mold cavities corresponding to the outer layer, middle layer and inner protective layer.

[0035] c. The fiber-reinforced network and temperature sensor are pre-fixed and connected to form a whole, and then placed into the casting cavities of the corresponding outer and inner protective layers in the main arc-shaped mold frame. The temperature sensor and the positioning groove on the inner circumference of the corresponding casting mold cavity form an insertion and positioning fit to position the whole fiber-reinforced network.

[0036] d. Pour shape memory epoxy resin matrix into the casting mold cavity corresponding to the outer and inner protective layers of the main arc-shaped mold frame, with the viscosity controlled at 600-900 mPa·s to the required layer thickness.

[0037] e. Prepare a UHPC mixture containing toughness-enhancing filler, pour it into the casting cavity of the corresponding middle layer in the main arc-shaped mold frame, and vibrate it at a high frequency of 30,000 to 40,000 r / min for 2 to 3 minutes until it is compacted.

[0038] f. After the outer, middle, and inner protective layers of steps d and e have been formed and stabilized, the partition template is pulled out from the top of the main arc-shaped mold frame. The outer, middle, and inner protective layers form a cavity with each other. The cavity is filled with temperature-sensitive structural adhesive until the three-layer structure is bonded and fixed.

[0039] g. After curing, separate the two arc-shaped half-frames of the main arc-shaped mold frame and demold them to obtain the finished lining unit.

[0040] In summary, this invention constructs an intelligent tunnel lining structure that combines temperature response and mechanical reinforcement functions through a fiber-reinforced network of carbon fiber and glass fiber in the outer and inner protective layers, combined with a three-dimensional toughness reinforcement system of steel fiber and graphene composite in the intermediate UHPC layer. T g When the set value is reached, the matrix of the outer and inner protective layers softens, releasing the constraint stress on the middle UHPC layer. Simultaneously, the toughness-enhancing system inhibits the propagation of internal cracks in the UHPC, achieving a protective effect without bursting failure at 600℃. This invention, through optimized material formulation and structural design, ensures excellent temperature response performance while maintaining the mechanical properties (compressive strength ≥150MPa, flexural strength ≥35MPa) and structural synergy of the lining structure. The edge nickel-chromium alloy wire temperature sensor is designed for sensitive response and can be connected to an external intelligent monitoring system for real-time temperature monitoring, avoiding functional degradation after long-term use. Using the mold of this invention to manufacture the lining structure reduces industrial production difficulty, eliminates the need for additional complex protective facilities, and achieves integrated molding of the FRP layer and UHPC layer. This results in high product consistency (temperature response error coefficient of variation ≤3%), convenient construction, low maintenance costs, and long service life. It can be widely used in engineering structures such as highway tunnels, railway tunnels, subway sections, and underground integrated pipe corridors, combining functional practicality with engineering economy.

[0041] The above description is intended to illustrate the technical means of the present invention and is not intended to limit the scope of the invention. Any obvious improvements or substitutions made to the present invention by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A temperature-sensitive intelligent response tunnel lining structure, characterized in that... The tunnel lining structure includes an outer layer (1), a middle layer (2), and an inner protective layer (3). The three layers are bonded together by a temperature-sensitive structural adhesive (4) to form an integral arc-shaped lining unit with strong interfacial bonding. The outer layer and the inner protective layer are both FPR fiber-reinforced composite material layers. The matrix of the fiber-reinforced composite material layer is shape memory epoxy resin, and a continuous fiber reinforcement network (6) is distributed inside. The middle layer is a UHPC layer, that is, ultra-high performance concrete as the matrix, and toughness-enhancing filler is uniformly mixed inside to form a three-dimensional reinforcement system. Temperature sensors (5) are embedded at the edges of the outer layer and the inner protective layer. The temperature sensors are connected to the corresponding fiber reinforcement network to form a temperature sensing system. Based on the overall bonding of the three-layer structure, the fiber reinforcement network and the toughness-enhancing filler form a synergistic force system of mechanical bearing and thermal stress resistance.

2. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, characterized in that... The fiber-reinforced network (6) in the outer layer (1) and inner protective layer (3) is made of carbon fiber and glass fiber mixed together, with carbon fiber accounting for 15% to 25% of the total fiber mass.

3. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, characterized in that... The toughness-enhancing filler of the middle layer (2) is a composite system of steel fiber and graphene. The steel fiber has a length of 12-18 mm and a volume fraction of 3%-5%. The graphene content is 0.5%-1.0% of the mass of the cementitious material when making the middle layer.

4. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, characterized in that... The temperature sensing element (5) is a nickel-chromium alloy wire. One side of the nickel-chromium alloy wire is embedded inside the edge of the fiber-reinforced composite material layer and is in close contact with the internal fiber-reinforced network. The other side extends out of the lining unit with an extension length of 8 to 12 mm.

5. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, characterized in that... The outer layer (1) and the inner protective layer (3) each have a thickness of 4 to 8 mm, the middle layer (2) has a thickness of 150 to 200 mm, the lining unit has an arc of 90° to 120°, and the width of a single lining unit is 1200 to 1500 mm.

6. The temperature-sensitive intelligent response tunnel lining structure according to claim 1, characterized in that... The inner and outer surfaces of the middle layer (2) are both provided with a textured surface with a depth of 2 to 3 mm.

7. A mold for manufacturing the temperature-sensitive intelligent response tunnel lining structure as described in claim 1, characterized in that... The mold includes a main arc-shaped mold frame (8) formed by splicing two arc-shaped half-frames, and two arc-shaped partition templates (10). The main mold frame is provided with an arc-shaped casting cavity with an open top surface. That is, arc-shaped half-casting cavities are formed in the two arc-shaped half-frames respectively. The splicing part between the two arc-shaped half-frames is locked and fixed by a locking member (9). The two ends of the partition template form a sliding insertion fit with the two ends of the arc-shaped casting cavity in the main arc-shaped mold frame. After the two partition templates are inserted and fitted, they divide the arc-shaped casting cavity into three casting mold cavities corresponding to the outer layer (1), middle layer (2) and inner protective layer (3) respectively. After the three casting mold cavities are cast and formed, the partition template is pulled out. The outer layer, middle layer and inner protective layer form a glue cavity filled with the temperature-sensitive structural adhesive (4).

8. The mold for manufacturing the temperature-sensitive intelligent response tunnel lining structure according to claim 7, characterized in that... The main arc-shaped mold frame (8) has positioning grooves (802) at both ends of the casting mold cavity corresponding to the outer layer (1) and the inner protective layer (3), corresponding to the temperature sensing elements (5) at both ends of the fiber reinforcement network (6). The bottom of the two arc-shaped half-frames of the main mold frame is provided with positioning grooves corresponding to the temperature sensing elements at the bottom of the fiber reinforcement network.

9. The mold for manufacturing the temperature-sensitive intelligent response tunnel lining structure according to claim 7, characterized in that... The dividing template (10) has vertical ribs (1002) evenly spaced along the arc direction on one side of the casting mold cavity facing the middle layer (2).

10. A method for manufacturing a mold for a temperature-sensitive intelligent response tunnel lining structure as described in claim 8, characterized in that... The production method includes the following steps: a. Clean the arc-shaped casting cavity and the partition template (10) of the main arc-shaped mold frame (8), and evenly apply release agent to the inner wall of the arc-shaped casting cavity and the partition template. The thickness of the application is 0.1-0.2 mm. Let it stand for 15-20 minutes until the release agent is surface dry. b. The two arc-shaped half-frames are spliced ​​together to form the main arc-shaped mold frame, and the dividing template is inserted to the bottom along both ends of the main arc-shaped mold frame to divide the arc-shaped casting cavity into three casting mold cavities corresponding to the outer layer (1), middle layer (2) and inner protective layer (3); c. The fiber-reinforced network (6) and the temperature sensor (5) are pre-fixed and connected to form an integral whole, and respectively placed into the casting cavities of the outer and inner protective layers in the main arc-shaped mold frame. The temperature sensor and the positioning groove on the inner circumferential surface of the corresponding casting mold cavity form an insertion positioning fit to position the entire fiber-reinforced network. d. Pour shape memory epoxy resin matrix into the casting mold cavity corresponding to the outer and inner protective layers of the main arc mold frame, and control the viscosity at 600-900 mPa·s to the required layer thickness; e. Prepare a UHPC mixture containing toughness-enhancing filler, pour it into the casting cavity of the corresponding middle layer in the main arc-shaped mold frame, and vibrate it at a high frequency of 30,000 to 40,000 r / min for 2 to 3 minutes until it is compacted; f. After the outer, middle and inner protective layers of steps d and e have been formed and stabilized, the partition template is pulled out from the top of the main arc-shaped mold frame. The outer, middle and inner protective layers form a cavity with each other. The cavity is filled with temperature-sensitive structural adhesive (4) until the three-layer structure is bonded and fixed. g. After curing, separate the two arc-shaped half-frames of the main arc-shaped mold frame and demold them to obtain the finished lining unit.

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